Imo what Sanders is doing schematically is no different that what Caleb is doing.
The only difference is Sanders is working with less so he's better built to deal with tougher circumstances and having to really work on processsing.
The TWO issues though imo.
Sanders actually isnt doing more than Caleb when he actually should. Because the windows are tighter, because their is a lesser Oline, he should be throwing more with anticipation, navigating the pocket, etc etc.
Right now they are just doing typical air raid stuff of if we throw it enough the defense will tire down and make mistakes eventually. They should let Shedeur throw more over the middle of the field. Not care about his completion % with all these check downs and instead challenge himself to throw more tight window throws. Right now he's either throwing short passes or throwing deep passes.
The other issue though is as of now Im not sure he's twitchy enough. Caleb is very twitchy so even if he's not using the proper eye movement to find his reads he can still create out of structure. Ideally there's enough there to work with to get him to work within structure at a high level one day.
Right now Shedeur seems heavy footed like Jameis was. Its why Shedeur retreats when there is pressure and doesnt slide (when his Oline gives him a throwing lane) to throw the ball. Shedeur got the easier/smoother throwing motion so he wont have the issues Jameis has in terms of being rushed and his accuracy failing.
However, he's not as twitchy as Geno was in college (yet). And frankly Im so use to even the pocket passing QBs like Darnold having really good athleticism that its jarring to see Shedeur lumber out there (until he gets up to speed).
Hopefully he spends more time working with Brady on footwork. They gotta get him lighter on his feet so he can reach his full potential.
The issue I have with this is it just misses a lot.
2 is a better passer. He's much smarter. He processes much faster. When he hits his last drop, he's always finished with his progressions and reset his progression or waiting for a route to be completed where he can time it correctly. He makes better decisions. He's more more composed than Williams. He's superior within the pocket. He makes his OL look better than what they are. Williams by his player type does as well but he's not like that in the pocket.
You talk about heavy footed. I see exceptional footwork speed in the pocket. Now when he's moving laterally is it good, no but that's more agility based and it's a mobile QB or balanced QB skill. Footwork speed and technique is what's critical to me since he's a pocket passer. What messes up Jameis is his feet are slow, his technique is better than 2 but when you have slow footwork like him and Leftwich, the defense is generally in your grill before you compete your drop.
He isn't the level of athlete that Geno and it doesn't really matter. Unlike Geno, he's was world class are presnap reads as a true freshman. He's just mentally on another level. His post snap reads are much better right now than Geno.
Shedeur's footwork technique is the area where I want to see the most growth but it takes time. Rarely do you see a college kid with exceptional footwork technique. Josh Rosen had it but he had horrendous footwork speed which killed him in the NFL.
He's just a massively better player than most of the guys you named. He's got aways to go but there might be a chance he could be seen in regard to Brady. He's got a lot to work on
Grades don't lie, this kid is the real deal.